Please solve as detailed as possible Thanks Per 1000 US doll

Please solve as detailed as possible

Thanks

Per 1,000 US dollars, proportionately how many fewer barrels could be shipped on Route 4 than Route 1 in Year 2? 0.16 0.17 0.18 0.19 0.20

In the year 2 shipping costs for route 4 is 2.58 and route 1 is 2.16.

we have to find fewer barrels from route 4 to route 1 that is 2.58-2.16 / 2.16= 0.42 / 2.16 = 0.19